Coding Standards: Remove extra unset() in rest_handle_options_request().

`$args` is defined in the immediately preceding code block, and only contains non-integer keys, so there is never an `$args[0]` to unset.

Follow-up to [44933].

Props justlevine.
See #52217.

git-svn-id: https://develop.svn.wordpress.org/trunk@59456 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/rest-api.php

@@ -818,9 +818,6 @@ function rest_handle_options_request( $response, $handler, $request ) {
 		}
 
 		foreach ( $endpoints as $endpoint ) {
-			// Remove the redundant preg_match() argument.
-			unset( $args[0] );
-
 			$request->set_url_params( $args );
 			$request->set_attributes( $endpoint );
 		}